mirror of https://github.com/Chocobozzz/PeerTube
110 lines
3.3 KiB
TypeScript
110 lines
3.3 KiB
TypeScript
import { NextFunction, Request, Response } from 'express'
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import { ActivityPubSignature } from '../../shared'
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import { logger } from '../helpers/logger'
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import { isHTTPSignatureVerified, isJsonLDSignatureVerified, parseHTTPSignature } from '../helpers/peertube-crypto'
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import { ACCEPT_HEADERS, ACTIVITY_PUB, HTTP_SIGNATURE } from '../initializers'
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import { getOrCreateActorAndServerAndModel } from '../lib/activitypub'
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import { loadActorUrlOrGetFromWebfinger } from '../helpers/webfinger'
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async function checkSignature (req: Request, res: Response, next: NextFunction) {
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try {
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const httpSignatureChecked = await checkHttpSignature(req, res)
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if (httpSignatureChecked !== true) return
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const actor = res.locals.signature.actor
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// Forwarded activity
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const bodyActor = req.body.actor
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const bodyActorId = bodyActor && bodyActor.id ? bodyActor.id : bodyActor
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if (bodyActorId && bodyActorId !== actor.url) {
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const jsonLDSignatureChecked = await checkJsonLDSignature(req, res)
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if (jsonLDSignatureChecked !== true) return
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}
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return next()
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} catch (err) {
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logger.error('Error in ActivityPub signature checker.', err)
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return res.sendStatus(403)
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}
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}
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function executeIfActivityPub (req: Request, res: Response, next: NextFunction) {
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const accepted = req.accepts(ACCEPT_HEADERS)
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if (accepted === false || ACTIVITY_PUB.POTENTIAL_ACCEPT_HEADERS.indexOf(accepted) === -1) {
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// Bypass this route
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return next('route')
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}
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logger.debug('ActivityPub request for %s.', req.url)
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return next()
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}
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// ---------------------------------------------------------------------------
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export {
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checkSignature,
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executeIfActivityPub,
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checkHttpSignature
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}
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// ---------------------------------------------------------------------------
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async function checkHttpSignature (req: Request, res: Response) {
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// FIXME: mastodon does not include the Signature scheme
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const sig = req.headers[HTTP_SIGNATURE.HEADER_NAME] as string
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if (sig && sig.startsWith('Signature ') === false) req.headers[HTTP_SIGNATURE.HEADER_NAME] = 'Signature ' + sig
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const parsed = parseHTTPSignature(req)
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const keyId = parsed.keyId
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if (!keyId) {
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res.sendStatus(403)
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return false
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}
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logger.debug('Checking HTTP signature of actor %s...', keyId)
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let [ actorUrl ] = keyId.split('#')
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if (actorUrl.startsWith('acct:')) {
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actorUrl = await loadActorUrlOrGetFromWebfinger(actorUrl.replace(/^acct:/, ''))
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}
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const actor = await getOrCreateActorAndServerAndModel(actorUrl)
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const verified = isHTTPSignatureVerified(parsed, actor)
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if (verified !== true) {
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res.sendStatus(403)
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return false
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}
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res.locals.signature = { actor }
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return true
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}
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async function checkJsonLDSignature (req: Request, res: Response) {
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const signatureObject: ActivityPubSignature = req.body.signature
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if (!signatureObject || !signatureObject.creator) {
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res.sendStatus(403)
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return false
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}
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const [ creator ] = signatureObject.creator.split('#')
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logger.debug('Checking JsonLD signature of actor %s...', creator)
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const actor = await getOrCreateActorAndServerAndModel(creator)
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const verified = await isJsonLDSignatureVerified(actor, req.body)
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if (verified !== true) {
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res.sendStatus(403)
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return false
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}
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res.locals.signature = { actor }
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return true
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}
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